STA381BWS datasheet(34/171 Pages) STMICROELECTRONICS

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Device overview

STA381BWS

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Doc ID 018937 Rev 6

4.3.7

Offset

The offset is a user-selectable gain or volume control. When using the STC it is advised to

use the offset to tune the output volume instead of the regular volume controls. The offset is

located before the attenuator block, ensuring that the output power limit (limiter threshold) is

never exceeded (Figure 12). On the other side, the traditional volume control is located after

the STC attenuator, thus a wrong setting of this control could nullify the STC effect.

Each sub-band has its own and independent offset. Its range is [0, +48] dB with a 0.25 dB

step (Table 12).

Figure 12.

Offset effect

4.3.8

Stereo link

The stereo link feature allows applying the same attenuation to the corresponding band of

each channel (i.e. band 0 left channel and band 0 right or band 1 left channel and band 1

right channel). This should help to prevent image shifting that could occur when individually

compressing each channel and causing a volume mismatch between left and right.

When the stereo link is active, the proper attenuation for each band is independently

computed, then the highest one for each band is applied (Figure 13).

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